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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Not optional: Abbr. 4 letters:

RTES: Traveler's option: Abbr.
RTES: Driver's options: Abbr.
RTES: Travel options: Abbr.
ITAL: Font option: Abbr.
RTES: GPS options: Abbr.
RTES: Traveler's options (abbr.)
IUDS: Birth control options: Abbr.
REQD: Not optional: Abbr.
HMOS: Insurance options: Abbr.
ELEC: Range option: Abbr.
FNMA: Investment option (abbr.)
HDTV: Screen option (abbr.)
CDRW: Reusable data storage option introduced in 1997: Abbr.
USAA: Insurance option for military families: Abbr.
USAA: Insurance option for families of veterans: Abbr.
RRS: Commuting options: Abbr.
IRA: Investment option: Abbr.
RTE: Waze option: Abbr.
HRT: Menopause treatment option: Abbr.
REG: Gas pump option (Abbr.)
DSL: Browsing option: Abbr.
REG: Gas station option: Abbr.
CDS: Investment options (abbr.)
ENL: Photo reprint option: Abbr.
RTE: Trip option: Abbr.
RDS: GPS options: Abbr.
LTR: Print setup menu option: Abbr.
RMS: Cruise ship options: Abbr.
RTE: Travel option (abbr.)
TPK: Pay-as-you-go option (abbr.)
HMO: Managed care option (abbr.)
DSL: Broadband option: Abbr.
RRS: Tourist's options: Abbr.
RRS: Travelers' options: Abbr.
EBT: Grocery-payment option: Abbr.
DSL: Connection option: Abbr.
IRA: Savings option: Abbr.
IUD: Contraception option: Abbr.
CDS: Savings options: Abbr.
GED: Highschooler's option: abbr.
REQ: Not optional: Abbr.
IRA: Saver's option: Abbr.
ALT: Option: Abbr.
ATM: After-hours banking option: Abbr.
REC: VCR option: Abbr.
ESC: Computer option: Abbr.
ASPCA: Adoption option: Abbr.
AUX: TV tuner input option: Abbr.
LTR: Photocopier option: Abbr.
REG: Lower-priced gas option: Abbr.